If you're not a fan of putting this whole thing together yourself these guys in Taiwan make a really nice mechancial keyboard called the Tex Yoda 2. Kinda hard to get though...
The keyboard is meh and the trackpoint is a delusion. For example, the trackpoint on my endurapro moves at different speeds depending on the direction you're moving to. That makes no sense.
The current version is the TrackPoint IV.
More on the topic, unfortunately does not include usage in external keyboards: http://www.thinkwiki.org/wiki/TrackPoint